Pulley covering or facing.



.- OFFICE.

LUDWIG ,GUTMANV'N, or s'r. LOUIS, MIssounIl PULLEY COVERING OR FACING.

Specification of Letters Patent. it

Patented Jan. 9, 1917.

Continuation of application SerialNo. 722,915, filed September 2 8, 1912. This application filed May 21, 1914.

SerialNo. 840,003.

To all whom it may concern Be it known that I, LUDWIG GUTMANN, a citizen of the United States, and residing at St. Louis, in the State of Missouri, have invented certain new and useful Improvements in Pulley Coverings or Facings, of

which the following is a specification.

This invention relates .to pulleys, and

more particularly, to rims or coverings therefor. T

This application is a continuation of my co-pending application, Serial No. 722,915," filed September 28, 1912, as 'to,,subject mati is com'm'onto the two applicaterf which tions. c

i In every industry, it frequently happens that it is desirable to increase the speed of a tool or counter shaft, or to obtain a greater tractive' efiect between the belt and the pulley. For speed increase, the question resolves itself into the buying of a new pulley. In order to obtain greater tractive efi'ect. a diflerentpulley having a more suitable rim must be bought, or the co-eflicient of friction must be increased in some other manner, as by providing a pulley facing having a higherco-eflicient of friction. I

The pulley facings heretofore suggested and applied have been ofthe individual type, and were made and finishedr'on the premises where the pulley was used. It re quired individual fitting forlength, width and anchoring, and special skill in applying. The cost of some of these facings is higher than a new pulley, since expensive material, involving considerable waste, was cut up into rings and applied. Such wasteful and costly change .is only warranted when there is no time for other changes, or when the resulting consequences 'due to delay far outweigh such expenditures. s

' The objects of'this invention, therefore,

are,' to providea pulley covering or facing which will overcome the defectsof the -present construction, atthe same time retaining its advantages, and possessing additional advantages; which can be readily applied to a pulley, and which has a universal applicationto pulleys of different diameters and widths. 7

Further objects will appear from'the deapplication referred to.

tail description taken in connection with the accompanying drawings, in which:

Figure 1 is a vertical detail section through a pulley rim, showing the facing applied thereto, Fig. 2 is a plan view of Fig. 1, Fig. 3 is a detail side elevation of one of the links or laminations, Fig. 4 is a plan view of Fig. 3, Fig. 5 is a section on the line 55, Fig. 2, Fig. 6 is a-plan view of a section of a pulley covering, illustrating, another embodimentof this invention, Figs. 7 and 8 are details of different forms of links, Fig. 9 is a vertical section through a pulley rim. illustrating another embodiment of this invention, Fig. .10 is a plan of Fig. 9,,Fig. 11 is a detail showing another form of link, and Fig. 12 is a side elevation of still anotherform of'link, Fig. 13 is a plan of Fig, 12.

Referring to the accompanying drawings, and more particularly, to Figs. 1 to 5 inclusive, 1O designates a pulley rim, which may be of wood. iron, or even of stamped sheet metal, as shown and described in the This rim is adapted to receive the pulley covering which forms the subject matter of this invention. This pulley covering comprises a series of sectional laminations or. links 11, perforated. as shown at 12. These laminations may be formed of leather, canvas, cloth. or paper," and, in view of the fact that they are comparatively i small, waste material may be used. A seriesof these links or sectional laminations are interlinked and assembled in overlapping relation by rivets or wire 13. so as to'form together a chain-like and flexible structure. Anynumber of these sectional laminations can be built up to form a covering of any desired length or width. This covering canbe laid on the i 7 same With another mat'erialj. :Such a link practice, the hollow rivets Will be placed at regular intervals along the covering. In

" view of the'fact rthat 'the covering iscemented or gluedto the'pulley' rim, the rods will, ordinarily, be unnecessary.

The links or sectional lam nations- 11 may be secured together by' thread, Wire, or' leather passed zig zag therethrough, as shown in F ig. 6.

For pulleys of 3 large diameter, the lcove i ving can generally be stretched enough so 3 that a i -ivet o'r Wire' 'caii be slippedltlirough the holes 12 of the end links. It is,-h'oW- link ever, desirable, in some cases, toprovide for adjustabil'ity. For tliispur'pose, extralmks 23,.Fig. 7 or 24,..Fig. 8 are provided. The

M is provided, in additioh to theholes with one or more intermediateholes 26.

In a case, .therefore, Where shorter link' must be provided, this link" can be cutofl ona line 27- soQas to form such a shortlink,

asshownin' Fig. 8,. or this short liI'ik,.Fig".

' maybepi'ovidediin the first instance.

Figs 9 andll) show anotheriorm of end link" c'onnection, inovhich the" links 30 are slotted, asishoivn atf m, to slip over a cross piii32int1'1e shameless; Themein s2 is preferably larger thanthe rivets or Wires 1:3'offthe-other'1inks 115, so s'a form a good bea 'Iig,andthe ndjinks 30 arepreferably c'onstifiicted of metal, While the end links 33 i can be made of the same" material as the other linksull. In applying this form" of r co'veringme endsarebrought together'and It Will be und rstood, of course,

mentored end links 30' tasked over the cross that this covering is cemented. or glued on i f the pulley rim intlie same manner "as in the "The links-1 may have tlie. perforations 12 positioned medially of the depth of the link, but these perforations 35 may be placed nearer thefl'otver edge of the link 36, as shown-in Fig"; 11, so as to permit the coveringtobe turned down, if so desired: The lower corners 37 of the link are rounded, as

I shoWniin Fig; 11, so as to perrnit fiexure of the covering,

' Wher a material such as paper or gleaneused, itmay be desirable to reinforce the i isj'sliown ilf Figs? 12 and these fig: f uresgAO designates a bodyior core, which may be; formed of laminae of-paper', cloth,-

canvas; or; any other. suitable'mat'erial, which ls reinforced or clad onone or both faces with plates '41 of metal or f-any other "suitable 7 material having ahigh shearing strength;

Where'meta'l is used, this plate 41* may be provided ivitlr struck up lugsA2 for attachthe platestothe body or core" 40. The apertures 43" in the" plates-"arepreferably "made larger than the apertures 44'" in the;

core? so;as toallbw for slight elongation .o-fi the holes et when -atlie cottering stretched bi-lityL alsozbeibuiltu'pofa number of layers of leather, paper, cloth, or canvas, compressed and condensed toform composite links or' over the pulley rim. The plates ll are preferably made smaller than the core 40. It

will beunderstood that the body or core of the'link may. be reinforced with any other suitable material, such as, leather or strong cloth. Inthe lattercase, a composite sheet, made up 'ofacenter sheet and clad With sheets of-reinforced material cemented together can be cut up into links.

' In; all; ofthe constructions heretofore described, the laminations are joined side by side with their edges exposedto form flexible'chain-like pulley facing. This pulley facing can be secured to the pulley rim With glue, and the interstices between the links or sectional .lamiiiations can then be filled with glue, filler, rubber, or any othersuit able cdmpo'sitiomso' as'to forman uninter rupte'dpulley' facing. This pulley covering can bea'ppliedt'o any pulley, and when" positiofi will form a c'ov'erlng haying not only great strength" and durability, but also a high c'o'efficient of'friction. The-covering'can be kept in stock and used on pulleysof diffei ent diameters and difi'erent Widths of faces.

In all of'tliese'constructions; the sectional laminations or linksmay'besubjected to a preliminary treatmentwith an impregnating substance, such as, glues, varnishes, gums, rubber,- bala'ta, or coal tar or its products, and

this treatment may be given the laminations or links before'or after they area-ssembled'to 7 form the covering. These l amifi'ations or links may individually, as Well as collectively, when assembled, be subjected to pres sure" between rollers so'asto condense the" fibers and i-nc-rease their strength and-dura- The individual laminatio'ns may saving. of bearings. It has a strength in a direction Where the greatest strength is necessary, namely, 1n a radial direction, and will, therefore, reslst crushing, In T View of the P fact,however, that the covering engagesthe entire 'circumference of the pulley and can "be glued thereto over its entire circum- V ference, the tensile strength does not enter and can-, the1"efore, -be small sis-distinguished frombelting. This flexible construction ofthe pulley covering, therefore,-- results not only in greater adhesion, but also in greater flexibility. In view of the fact that the covering is made up of short pieces, Waste material can be used, and the resultant covering, Will, therefore, be cheap, even if a comparatively expensive material, like leather, is used. Moreover, the covering can, on account of its flexibility and sectional construction, be applied to pulleys of different diameter, so that only a few sizes of covering need be kept in stock.

It is obvious that various changes may be made in details of construction Without departing from the spirit of this invention, and it is, therefore, to be understood that this in- Oopies of this patent may be obtained for five cents each, by addressing the vention is not to be limited to the specific construction shown and described.

Having thus described the invention, What is claimed is:

A pulley having an applicable rim covering comprising a series of circumferentially extending links flexibly joined together endWise to form a flexible pulley facing. a

In testimony whereof I afiix my signature in the presence of these two witnesses.

LUDWIG GUTMANN. Witnesses J. H. BRUNINGA, GERTRUDE A. HEYMANN.

Commissioner 01' Patents,

Washington, D. 0. 

